Attachment for metal planers and shapers.



A. D. GREGORY & P. G. SANDERS. v ATTACHMENT FOR METAL PLANERS ANDSHAPERS.

APPLICATION FILED JULY 3, 1912.

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ARTI-IUR D. GREGORY AND FRED G. SANDERS, OF ALBANY, OREGON.

ATTACHMENT FOR METAL PLANERS AND SHAPERS.

Specification of Letters Patent.

Patented May 20, 1913.

Application filed July 3, 1912. Serial No. 707,532.

To all whom it may concern:

Be it known that we, ARTHUR D. GREGORY, subject of the King of England,and F RED G. SANDERS, a citizen of the United States, both residing atAlbany, in the county of Linn and State of Oregon, have invented certainnew and useful Improvements in Attachments for Metal Planers andShapers, of which the following is a specification, reference being hadto the accompanying drawings.

Our invention relates to new and useful improvements in attachments formetal planers or shapers and more particularly to a tool attachmenttherefor and the primary object of the invention is to provide a devicewhich will prevent the tool from engaging the work upon the return ofthe former to its initial position. a

A further object of the invention resides in the provision of a hingedmember disposed between the tool proper and the tool post and which isadapted to project below the cutting edge of the tool, whereby saidhinged member will contact with the work upon the return movement of thecarriage to prevent the engagement of the cutting edge of said tool withthe work.

Still another object of the invention. resides in the provision of adevice which is extremely simple and durable in construction,inexpensive to manufacture and one which will be very efiicient anduseful in operation.

With these and other objects in view, the invention consists in thenovel features of construction, combination and arrangement of parts aswill be hereinafter referred to and more particularly pointed out in thespecification and claims.

In the accompanying drawing forming a part of this application, Figure 1is a side elevation showing our device applied to use on a tool post anddisclosing the same in position as the carriage is being returned. Fig.2 is a similar view showing the tool engaging the work and theattachment in its ineffective position; Fig. 3 is a perspective view ofthe attachment; and Fig. 4: is a front elevation showing our improveddevice applied to a tool designed to form a T-slot.

In describing our invention, we shall refer to the drawing in whichsimilar reference characters designate corresponding parts throughoutthe several views and in which- 1 indicates a carriage or the like of aplaner or shaper which has pivotally carried on the end thereof in theusualor any pre ferred manner, 'the tool post 2 and projectmg from thefront face of the post 2 are a plurality of pins or studs 3 betweenwhich is adapted to be held the tool 4. This tool is held to the toolpost between the pins or studs 3 by means of the transverse bars or thelike 5 which are secured in position over the front face of the tool bymeans of the nuts 6 engaging the outer ends of said pins 3, but while wehave shown and described this particular means of retaining the tool inposition on the post, it will be understood that any means may beprovided as the same is one of the minor and unessential features of theinvention. For a matter of convenience, the work to be operated on isshown in the drawing as 7.

It is a well known fact among machinists and others working in the metalworking art, that upon the return of the carriage to its initialposition, the cutting edge of the tool carried thereby will be draggedacross the surface of the work, thereby nickingor scarring the same inview of the hardness of the metal of which the tool is formed. In orderto obviate this difliculty, we-provide our improved attachment whichcomprises an elongated strip 8 formed of any desired material and whichis adapted to be clamped between the tool proper and the post therefor,the lower end of the said strip having hinged thereto, a plate 9. Thepoint of hinging between the strip 8 and the plate 9 is disposedimmediately below the lower face of the tool post and the plate 9 is ofsuch proportions as to project beyond the sides of and below the cuttingedge of the tool, when the latter is effectively positioned on the toolpost. From this construction it will be seen that as the carriage ismoved in one direction, the cutting edge of the tool will engage thesurface of the work to remove a portion thereof, at which time the plate9 will be swung on its hinging point to be dragged across the surface ofthe work, as shown in Fig. 2. At the termination of the stroke of thecarriage, which is beyond one edge of the work, the plate 9 will drop toa substantially vertical position and upon the return of the carriage toits initial position, said plate 9 will contact with the surface of thework, and thereby swing the tool post 2 on its pivot point and prevent,beyond all possibility, the cutting edge of the tool being engaged withthe surface of said work. The plate 9 may be formed of any desiredmaterial which is considerably softer than the metal from which the tool4 is formed, whereby the dragging of said plate across the surface ofthe work will not mar or scratch the same, particularly since said plateengages the rough portion thereof.

In Fig. a we have shown our improved device applied to a tool 4 designedto form a T-slot 7 in the material and it will be seen from said figure,which discloses the carriage on its return stroke, that said tool isentirely clear of the material. Thus any possibility of damaging thework thus far completed, is prevented.

From the foregoing it will be seen that we have provided a simple,inexpensive and elficient means for carrying out the objects of theinvention and while we have particularly described the elements bestadapted to perform the functions set forth, it is obvious that variouschanges in form, proportion and in the minor details of construction maybe resorted to within the scope of the appended claims without departingfrom the spirit or sacrificing any of the principles of the invention.

Having thus described this invention, what we claim is 1. In a machineof the class described, the combination with a carriage, a tool postpivoted thereto, and a tool carried by the post; of a plate adjustablycarried between the post and tool and having a pivotal portion thereonprojecting below the cutting edge of the latter to prevent said toolfrom contacting with the surface of the work upon the return movement ofsaid carriage.

2. In a machine of the class described, the combination with a carriage,a tool post piv otally carried thereon, and a tool carried by the post;of a strip clamped between said tool and tool post, and a plate hingedto the lower end of said strip, the hinging point being disposed belowthe lower face of said tool post and said plate being adapted to projectbelow the cutting edge of said tool.

3. In a machine of the class described, the combination with a carriage,a tool post pivotally carried thereon, and a tool removably clamped tosaid post; of a strip disposed between said post and tool and secured inposit-ion by the clamping means for the latter, the lower end of saidstrip being disposed to a 'point slightly below the lower end of saidpost, and a plate hinged to the lower end of said strip and adapted toproject below the lower cutting edge of said tool.

our signatures in the presence of two wit- Copies of this patent may beobtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

j In testimony whereof we hereunto affix

